Swiss banks signed an OECD agreement to share tax information. A few days later the Swiss Banks that had a presence in France released the names of 3000 French people with swiss bank account in Switzerland to the French. First mistake the French folks made was using Switzerland, which has shown itself to be an unreliable jurisdiction. Second mistake was using swiss bank account that had a presence in France their home country. Using an offshore bank with no presence in any other country is getting to be mandatory. Fourth mistake was not closing their accounts before the treaty was signed and in effect. If they closed their accounts they would not be covered by the new treaty and their old closed accounts would have still been protected under the old laws.